Wire kit with control unit for Shimano Dura Ace and Ultegra Di2. The control unit offers a battery charge indicator and a rear derailleur adjustment mode. This wire kit is equipped with connectors for the left and right STI. With additional EW-SD50 cables it connects the Di2 STIs with the junction box SM-JC40 or SM-JC41 and thereby with the front and rear derrailleur and the battery. Easy plug and play system to connect the cables.